Cummins/Onan — Replacing Thermostat
Maintenance · Engine cooling system
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDKAA, Cummins/Onan MDKAB, Cummins/Onan MDKAL, Kubota D1005 engine, Kubota D1105 engine, Kubota V1305 engine, Kubota V1505 engine
Before you start
- Hot coolant is under pressure and can cause severe burns when loosening the pressure cap.
Procedure
- Let engine cool, loosen pressure cap, disconnect negative battery cable(s).
- Remove the two thermostat housing bolts and pull off housing, thermostat and gasket.
- Clean off the gasket area.
- Reassemble with new thermostat and gasket.
- Apply Three Bond 1215 liquid sealant or equivalent to top side of gasket.
Specs & values
- Three Bond 1215 liquid sealant or equivalent
Full service-parts list: Cummins/Onan MDKAA →, Cummins/Onan MDKAB →, Cummins/Onan MDKAL →, Kubota D1005 engine →, Kubota D1105 engine →, Kubota V1305 engine →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.